Auto top off systems scare me. So I've been doing some research on a how to make one (almost) failure proof. Here is what I am planning
Parts Pictured, <$30, you can get cheaper than this though. But want starter kit.
Program Arduino to monitor float switch and turn on pump to top off, if it goes over 5-10 seconds turn it off and go into error mode, otherwise monitor float switch and turn off when full. This will keep from overflowing your tank and keep pump from running dry.
If unit goes into error mode, push button to reset.
Have several led's to display status,
Green All Good
Yellow Topping OFF activated
Red Error mode
You could have 2 relays, both would have to be on just in case one fails.
Parts Pictured, <$30, you can get cheaper than this though. But want starter kit.
Program Arduino to monitor float switch and turn on pump to top off, if it goes over 5-10 seconds turn it off and go into error mode, otherwise monitor float switch and turn off when full. This will keep from overflowing your tank and keep pump from running dry.
If unit goes into error mode, push button to reset.
Have several led's to display status,
Green All Good
Yellow Topping OFF activated
Red Error mode
You could have 2 relays, both would have to be on just in case one fails.
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